C-pillar reinforcement with noise reduction structure

Abstract

The utility model discloses a C column reinforcing piece with noise reduction structure, including C column reinforcing piece body, the bottom fixed mounting of C column reinforcing piece body has the damping layer, the bottom fixed mounting of damping layer has the intermediate layer, the inside of intermediate layer is equipped with a plurality of sound absorption cavities, the bottom fixed mounting of intermediate layer has the perforated layer, the inside of perforated layer is equipped with a plurality of with sound absorption cavity one to one corresponding microperforation. The utility model creates the outstanding acoustics through the precision cooperation of each layer, and the firm C column reinforcing piece body provides the reliable installation basis of entire assembly and is firmly combined with the car body. The gradually thick damping layer on its top as the core, with the stiffness characteristic of its change, efficiently dissipates the structure vibration energy of wide frequency band, fundamentally restraines the sheet metal resonance. The unique intermediate layer constructs the precision helmholtz resonance cavity array through the inside of several sound absorption cavities of its opening.

Description

Technical Field

[0001] This utility model relates to the technical field of C-pillar reinforcement, specifically a C-pillar reinforcement with a noise reduction structure. Background Technology

[0002] The C-pillar reinforcement is a crucial safety and performance component hidden within the rear side pillar of the vehicle. Like the vehicle's "ribs," its core mission is to significantly enhance the structural rigidity and torsional resistance of the rear of the body, and to efficiently transfer and absorb impact energy in side collisions, providing robust support for the passenger compartment—transcending its traditional single safety role. Modern vehicle designs commonly incorporate C-pillar reinforcements to strengthen this area. However, traditional reinforcements primarily focus on improving mechanical performance, which alters the local stiffness distribution of the body and may interact with cavities formed by the inner and outer panels, easily becoming vibration amplifiers and noise radiation sources during vehicle operation. Specifically, low-to-mid-frequency vibrations from the road surface and powertrain are transmitted through the body to the C-pillar, causing sheet metal resonance and radiating structural noise into the cabin. Simultaneously, wind noise and tire noise, among other airborne sound waves, easily resonate within the C-pillar cavity, severely compromising ride quietness.

[0003] Existing technologies typically address this by attaching damping sheets or filling with sound-absorbing cotton. However, these methods have inherent limitations, such as significant weight increase, limited noise reduction frequency, poor coupling with the structure, and low production efficiency. Therefore, we propose a C-pillar reinforcement with a noise reduction structure. Utility Model Content

[0004] The purpose of this utility model is to provide a C-pillar reinforcement with a noise reduction structure to solve the problems mentioned in the background art, which usually rely on subsequent application of damping sheets or filling with sound insulation cotton for remedies. However, this method has inherent limitations such as significant weight increase, single noise reduction frequency, poor coupling with the structure, and low production efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a C-pillar reinforcement with a noise reduction structure, comprising:

[0006] The C-pillar reinforcement body has a damping layer fixedly installed at its bottom, an intermediate layer fixedly installed at its bottom, a plurality of sound-absorbing cavities opened inside the intermediate layer, and a perforated layer fixedly installed at its bottom, with a plurality of micro-perforations corresponding one-to-one with the sound-absorbing cavities opened inside the perforated layer.

[0007] As a preferred embodiment of the C-pillar reinforcement with a noise reduction structure of this utility model, the damping layer is made of butyl rubber material, the bottom of the damping layer has a wavy structure, and the shape and size of the top of the damping layer match the shape and size of the C-pillar reinforcement body.

[0008] As a preferred embodiment of the C-pillar reinforcement with a noise reduction structure according to this utility model, the intermediate layer is made of plastic material, the intermediate layer has a wavy structure, and the shape and size of the intermediate layer match the shape and size of the bottom of the damping layer.

[0009] As a preferred embodiment of the C-pillar reinforcement with a noise reduction structure of this utility model, the sound-absorbing cavity is uniformly distributed along the interior of the intermediate layer, and the sound-absorbing cavity has a bottle-shaped structure.

[0010] As a preferred embodiment of the C-pillar reinforcement with a noise reduction structure of this utility model, the perforated layer is made of aluminum metal and has a wavy structure.

[0011] As a preferred embodiment of the C-pillar reinforcement with a noise reduction structure of this utility model, the micro-perforations are uniformly distributed along the interior of the perforated layer, and the micro-perforations are connected to the sound-absorbing cavity.

[0012] Compared with the prior art, this utility model provides a C-pillar reinforcement with a noise reduction structure, which has the following beneficial effects:

[0013] This invention achieves superior acoustic performance through the precise collaboration of each layer. The robust C-pillar reinforcement provides a reliable mounting base for the entire assembly and securely integrates with the vehicle body. The upper, gradually thickening damping layer acts as the core, efficiently dissipating broadband structural vibration energy with its varying stiffness characteristics, fundamentally suppressing sheet metal resonance. The unique intermediate layer, through its internally formed anechoic cavities, constructs a precise Helmholtz resonator array, transforming it into a "trap" for capturing specific frequency sound waves. The outermost perforated layer not only acts as a constraint layer, enhancing the shear deformation of the damping layer to improve vibration suppression, but its micro-perforations also form the neck of the resonator, precisely tuning with the anechoic cavities in the intermediate layer to convert target airborne noise into heat energy. Ultimately, this synergistic effect of "vibration suppression" and "sound absorption" within the same compact space achieves efficient dual control over broadband vibrations and specific noise peaks. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the perforated layer structure of this utility model;

[0016] Figure 3 This utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0017] In the diagram: 1. C-pillar reinforcement body; 2. Damping layer; 3. Intermediate layer; 4. Perforated layer; 5. Sound-absorbing cavity; 6. Micro-perforation. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-3 A C-pillar reinforcement with a noise reduction structure includes a C-pillar reinforcement body 1, a damping layer 2 fixedly installed at the bottom of the C-pillar reinforcement body 1, an intermediate layer 3 fixedly installed at the bottom of the damping layer 2, a plurality of sound-absorbing cavities 5 opened inside the intermediate layer 3, and a perforated layer 4 fixedly installed at the bottom of the intermediate layer 3, with a plurality of micro-perforations 6 corresponding one-to-one with the sound-absorbing cavities 5 opened inside the perforated layer 4.

[0020] In this implementation scheme: Superior acoustic performance is achieved through the precise collaboration of each layer. The robust C-pillar reinforcement body 1 provides a reliable mounting base for the entire component and is firmly integrated with the vehicle body. The gradually thickening damping layer 2 above it acts as the core, efficiently dissipating broadband structural vibration energy with its varying stiffness characteristics, fundamentally suppressing sheet metal resonance. The unique intermediate layer 3, through its internally formed anechoic cavities 5, constructs a precise Helmholtz resonant cavity array, transforming it into a "trap" for capturing specific frequency sound waves. The outermost perforated layer 4 not only acts as a constraint layer, enhancing the shear deformation of the damping layer 2 to improve vibration suppression, but its micro-perforations 6 also form the neck of the resonant cavity, precisely tuning with the anechoic cavities 5 within the intermediate layer 3 to jointly convert target airborne noise into heat energy. Ultimately, this synergistic effect of "vibration suppression" and "sound absorption" mechanisms within the same compact space achieves efficient dual control over broadband vibrations and specific noise peaks.

[0021] Furthermore:

[0022] In an optional embodiment, the damping layer 2 is made of butyl rubber material, the bottom of the damping layer 2 has a wavy structure, and the shape and size of the top of the damping layer 2 match the shape and size of the C-pillar reinforcement body 1.

[0023] In this implementation scheme: butyl rubber itself possesses a high internal friction factor, which can efficiently convert structural vibration energy into heat energy; while the gradient thickness design gives different natural frequencies to different regions, thereby extending the effective damping characteristics to a wider frequency range. Compared to a uniform thickness design, this scheme can achieve more comprehensive suppression of major low-to-mid-frequency noises such as road noise and engine vibration with a lighter overall weight, achieving a highly efficient synergy between noise reduction performance and lightweight goals.

[0024] Furthermore:

[0025] In an optional embodiment, the intermediate layer 3 is made of plastic material and has a wavy structure. The shape and size of the intermediate layer 3 match the shape and size of the bottom of the damping layer 2.

[0026] In this implementation scheme: the wave-like structure itself endows the intermediate layer 3 with higher geometric stiffness, achieving lightweight while providing stable support for the perforated layer 4 on its surface; its crests and troughs naturally form a regular cavity array for the Helmholtz resonance effect. More importantly, the perfect fit with the damping layer 2 ensures that vibration energy can be efficiently transferred between the two layers, enabling the damping vibration suppression and resonance sound absorption mechanisms to work synergistically, thereby greatly improving the overall broadband noise reduction performance within a limited space.

[0027] Furthermore:

[0028] In an optional embodiment, the silencing cavity 5 is uniformly distributed along the interior of the intermediate layer 3, and the silencing cavity 5 has a bottle-shaped structure.

[0029] In this implementation scheme, the core advantage of the bottle-shaped anechoic chambers 5 within the intermediate layer 3 lies in the construction of a highly efficient Helmholtz resonant sound absorption system. Each bottle-shaped anechoic chamber 5 consists of a narrow neck and a wide cavity, a structure capable of generating strong resonance for sound waves of a specific frequency. When noise waves of a specific frequency enter through the perforated layer 4, they induce violent vibrations in the air column at the neck of the anechoic chamber 5, converting sound energy into heat energy through friction and viscosity, thereby achieving precise and efficient absorption of noise at that frequency. This design transforms the intermediate layer 3 itself into an integrated resonant sound absorber array, particularly adept at eliminating difficult-to-handle low-frequency noise peaks, and its compact structure does not occupy additional space.

[0030] Furthermore:

[0031] In an optional embodiment, the perforated layer 4 is made of aluminum and has a wavy structure.

[0032] In this implementation scheme: the perforated layer 4, made of aluminum, is lightweight, highly rigid, and has excellent corrosion resistance. It serves as a highly efficient constraint layer, forcing the underlying damping layer 2 to undergo greater shear deformation to enhance energy dissipation. Its wavy structure not only allows for precise fit with the similarly shaped intermediate layer 3, ensuring the dimensional stability of the resonant cavity, but also significantly improves the rigidity of the plate itself, suppressing local vibrations. Furthermore, the wavy surface can more effectively disperse incident sound wave energy compared to a flat surface, and together with the micro-perforations 6, it further optimizes the overall broadband sound absorption performance.

[0033] Furthermore:

[0034] In an optional embodiment, the micro-perforations 6 are uniformly distributed along the interior of the perforated layer 4, and the micro-perforations 6 are connected to the sound-absorbing cavity 5.

[0035] In this implementation scheme, the micro-perforations 6 and the anechoic chamber 5, together using the aforementioned technology, constitute a highly efficient Helmholtz resonant sound absorption system. When sound waves enter the anechoic chamber 5 through the micro-perforations 6, the air column at the neck of the perforation moves like a piston, consuming sound energy through friction with the perforation wall; simultaneously, the air inside the sealed anechoic chamber 5 compresses and expands like a spring, converting the energy of sound waves at specific frequencies into heat energy. This structure can accurately and efficiently absorb target low-frequency noise, and its compact structure allows for the control of sound waves with wavelengths much larger than the structural dimensions within a minimal physical space, significantly improving noise reduction performance in the mid-to-low frequency range.

[0036] Working Principle: When using this C-pillar reinforcement with noise reduction structure, the damping layer 2 first takes effect when the vibration of the vehicle body is transmitted to the C-pillar reinforcement body 1. Its gradually thickened design converts the broadband mechanical vibration energy into heat energy, achieving the first layer of broadband suppression. Next, the sound waves radiated from the residual vibration and the directly transmitted air noise act on the perforated layer 4. The sound waves enter the anechoic cavity 5 inside the rear intermediate layer 3 through the micro-perforations 6. At this time, the Helmholtz resonance effect formed by the anechoic cavity 5 is activated, and sound waves of specific frequencies resonate intensely within the anechoic cavity 5. Through air friction and viscosity, the sound energy is converted into heat energy, achieving the second layer of precise absorption. Finally, the C-pillar reinforcement body 1 and the damping layer 2 are responsible for handling structural vibration, while the array formed by the perforated layer 4 and the intermediate layer 3 is responsible for absorbing airborne sound waves. The four layers together constitute a highly efficient "vibration suppression-sound absorption" integrated system, significantly improving the vehicle's quietness. This is the working principle of this C-pillar reinforcement with noise reduction structure.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A C-pillar reinforcement with a noise reduction structure, characterized in that, include: The C-pillar reinforcement body (1) has a damping layer (2) fixedly installed at the bottom of the C-pillar reinforcement body (1), an intermediate layer (3) fixedly installed at the bottom of the damping layer (2), a plurality of sound-absorbing cavities (5) are opened inside the intermediate layer (3), and a perforated layer (4) is fixedly installed at the bottom of the intermediate layer (3), with a plurality of micro-perforations (6) corresponding one-to-one with the sound-absorbing cavities (5) opened inside the perforated layer (4).

2. The C-pillar reinforcement with a noise reduction structure according to claim 1, characterized in that, The damping layer (2) is made of butyl rubber material. The bottom of the damping layer (2) has a wavy structure, and the shape and size of the top of the damping layer (2) match the shape and size of the C-pillar reinforcement body (1).

3. A C-pillar reinforcement with a noise reduction structure according to claim 1, characterized in that, The intermediate layer (3) is made of plastic material and has a wavy structure. The shape and size of the intermediate layer (3) match the shape and size of the bottom of the damping layer (2).

4. A C-pillar reinforcement with a noise reduction structure according to claim 1, characterized in that, The silencing cavity (5) is evenly distributed along the interior of the intermediate layer (3), and the silencing cavity (5) has a bottle-shaped structure.

5. A C-pillar reinforcement with a noise reduction structure according to claim 1, characterized in that, The perforated layer (4) is made of aluminum and has a wavy structure.

6. A C-pillar reinforcement with a noise reduction structure according to claim 1, characterized in that, The micro-perforations (6) are uniformly distributed along the interior of the perforated layer (4), and the micro-perforations (6) are connected to the sound-absorbing cavity (5).

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